What is the threshold for hydrogen sulfide in gas that Copper and copper alloy pipe should not be used?

Copper and copper alloy pipes are known to be susceptible to corrosion when exposed to hydrogen sulfide in natural gas. The threshold at which they should not be used is critical to ensure the longevity and reliability of the piping system.

A concentration of 0.3 grains per 10 standard cubic feet is the established limit for the safe use of copper materials in environments where hydrogen sulfide is present. Above this concentration, the risk of corrosion increases significantly, potentially leading to failures or leaks in the piping system.

Therefore, when the concentration of hydrogen sulfide in the gas reaches 0.3 grains per 10 standard cubic feet or higher, it is recommended to use alternative materials that can withstand the corrosive effects of hydrogen sulfide, rather than copper or its alloys. This understanding is vital for maintaining safe and effective gas distribution systems.